android - 如何向右或向左滑动以获取从 ListView Intent 开始的下一个 Activity 详细信息

Question

所以我有一个由 xml 数组列表填充的 ListView 。当我单击列表中的一行时，它会通过详细信息页面的 Intent 启动一个新 Activity 。我希望能够向右或向左滑动以获取与 ListView 中的下一行对应的下一个详细信息页面。我已经设置了我的 onSwipeRight 和 onSwipeLeft，它们可以工作，但我不知道在它们里面放什么来填充下一个/上一个详细信息页面。

这是我的主要 Activity ，带有 ListView 和点击监听器，用于将相关信息传递给详细信息 Activity

public class MainActivity extends AppCompatActivity {
MyDBHandler dbHandler;
int listViewPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    dbHandler = new MyDBHandler(this, null, null, 1);
    //Action Bar customization
    final android.support.v7.app.ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayOptions(android.support.v7.app.ActionBar.DISPLAY_SHOW_CUSTOM);
    actionBar.setCustomView(R.layout.actionbar);

    setContentView(R.layout.activity_main);

    //fill list view with xml array of routes
    final CharSequence[] routeListViewItems = getResources().getTextArray(R.array.routeList);
    ////fill list view with xml array of route numbers
    final TypedArray routeNumberImages = getResources().obtainTypedArray(R.array.routeNumberImages);
    //fills route detail text view with xml array info
    final CharSequence[] routeDetail= getResources().getTextArray(R.array.routeDetail);
    //fills route detail image view with xml array of images
    final TypedArray image = getResources().obtainTypedArray(R.array.routeImages);


    //custom adapter for list view
    ListAdapter routeAdapter = new CustomAdapter(this, routeListViewItems, routeNumberImages);
    final ListView routeListView = (ListView) findViewById(R.id.routeListView);
    routeListView.setAdapter(routeAdapter);

    //sets first visible list item
    listViewPosition = getIntent().getIntExtra("listViewPosition", 0);
    routeListView.setSelectionFromTop(listViewPosition, 0);

    routeListView.setOnItemClickListener(
            new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    CharSequence route = routeListViewItems[position];
                    int imageId = (int) image.getResourceId(position, -1);
                    if (route.equals(routeListViewItems[position]))
                    {
                        Intent intent = new Intent(view.getContext(), RouteDetails.class);
                        intent.putExtra("route", routeDetail[position]);
                        intent.putExtra("imageResourceId", imageId);
                        intent.putExtra("routeName", routeListViewItems[position]);
                        intent.putExtra("listViewPosition", position);
                        startActivity(intent);
                    }
                }
            }
    );
}

这是我的带有 onswipe 监听器的详细信息页面

public class RouteDetails extends AppCompatActivity {
MyDBHandler dbHandler;
ImageView routeImage;
String routeName;
CharSequence route;
CheckBox routeCheckBox;
int listViewPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_route_details);

    dbHandler = new MyDBHandler(this, null, null, 1);

    //sets actionbar title
    routeName = getIntent().getExtras().getString("routeName");
    getSupportActionBar().setTitle(routeName);

    //TextView for route details
    final TextView routeDetailsView = (TextView) findViewById(R.id.routeDetailsView);
    route = getIntent().getExtras().getCharSequence("route");
    routeDetailsView.setText(route);

    //ImageView for route details
    routeImage = (ImageView) findViewById(R.id.routeImage);
    final int mImageResource = getIntent().getIntExtra("imageResourceId", 0);
    routeImage.setImageResource(mImageResource);

    ///gets position of row that was clicked to pass into database
    listViewPosition = getIntent().getIntExtra("listViewPosition", 0);


    ///////////////

    routeDetailsView.setOnTouchListener(new OnSwipeTouchListener(this) {
        @Override
        public void onSwipeLeft() {
            // Whatever
            Intent i = new Intent(RouteDetails.this,RouteDetails.class);

            startActivity(i);
        }

    @Override
    public void onSwipeRight() {
        // Whatever
        Intent i = new Intent(RouteDetails.this,RouteDetails.class);

        startActivity(i);
    }

    });

    ///////////////

}

感谢您的帮助!

执行新代码后编辑出错

01-04 12:55:51.694 25443-25443/com.example.zach.listview E/AndroidRuntime: FATAL EXCEPTION: main
                                                                       Process: com.example.zach.listview, PID: 25443
                                                                       java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.zach.listview/com.example.zach.listview.RouteDetails}: java.lang.NullPointerException: Attempt to read from null array
                                                                           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                           at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                           at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                           at android.os.Looper.loop(Looper.java:148)
                                                                           at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                        Caused by: java.lang.NullPointerException: Attempt to read from null array
                                                                           at com.example.zach.listview.RouteDetails.onCreate(RouteDetails.java:56)
                                                                           at android.app.Activity.performCreate(Activity.java:6251)
                                                                           at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                           at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                           at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                           at android.os.Looper.loop(Looper.java:148) 
                                                                           at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                           at java.lang.reflect.Method.invoke(Native Method) 
                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Answer 1

您不应将单个项目传递到详细信息页面，而应传递整个数组以及当前位置(您已经这样做了)。

在你的点击事件(MainActivity)中，替换:

intent.putExtra("route", routeDetail[position]);
intent.putExtra("routeName", routeListViewItems[position]);

与:

intent.putExtra("routes", routeDetail);
intent.putExtra("routeNames", routeListViewItems);

在 RouteDetails 中，您需要获取数组和当前对象:

CharSequence[] routes;
CharSequence[] routeNames;

// ...

listViewPosition = getIntent().getIntExtra("listViewPosition", 0);

routes = getIntent().getExtras().getCharSequenceArray("routes");
routeNames = getIntent().getExtras().getCharSequenceArray("routeNames");

route = routes[listViewPosition];
routeName = routeNames[listViewPosition];

在您的滑动事件中，只需传入数组以及上一个或下一个索引:

routeDetailsView.setOnTouchListener(new OnSwipeTouchListener(this) {
    @Override
    public void onSwipeLeft() {
        // Whatever
        Intent i = new Intent(RouteDetails.this,RouteDetails.class);
        i.putExtra("routes", routes);
        i.putExtra("routeNames", routeNames);
        i.putExtra("imageResourceId", imageId);
        i.putExtra("listViewPosition", position + 1);
        startActivity(i);
    }

    @Override
    public void onSwipeRight() {
        // Whatever
        Intent i = new Intent(RouteDetails.this,RouteDetails.class);
        i.putExtra("routes", routes);
        i.putExtra("routeNames", routeNames);
        i.putExtra("imageResourceId", imageId);
        i.putExtra("listViewPosition", position - 1);
        startActivity(i);
    }
});